Hi, I love what you are doing guys and I use your app everyday. I will do my research here in Santiago, Chile.
For now I can give you this:
http://www.meteochile.cl/PortalDMC-web/index.xhtml
and
https://climatologia.meteochile.gob.cl/application/index/menuTematicoEmas
I will seek if there's FTP acceses. It somehow depends of the goverment and the military.
There where some thunder predicted today in Santiago, but as usual, no storms in Santiago, its a rare event.
I live in the premountain range of the city.
Have a good day!